linux-kernel - RE: [PATCH perf/core 00/22] perf refcnt debugger API and fixes

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Message-ID: <50399556C9727B4D88A595C8584AAB37526515DD@GSjpTKYDCembx32.service.hitachi.net>
Date:	Fri, 11 Dec 2015 02:08:18 +0000
From:	平松雅巳 / HIRAMATU，MASAMI 
	<masami.hiramatsu.pt@...achi.com>
To:	"'Wangnan (F)'" <wangnan0@...wei.com>,
	"'Arnaldo Carvalho de Melo'" <acme@...nel.org>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	"Namhyung Kim" <namhyung@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
	Alexei Starovoitov <ast@...mgrid.com>
Subject: RE: [PATCH perf/core  00/22] perf refcnt debugger API and fixes

From: Wangnan (F) [mailto:wangnan0@...wei.com]
>On 2015/12/10 23:12, 'Arnaldo Carvalho de Melo' wrote:
>
>[SNIP]
>> But this requires having these special refcnt__ routines, that will make
>> tools/perf/ code patterns for reference counts look different that the
>> refcount patterns in the kernel :-\
>>
>> And would be a requirement to change the observed workload :-\
>>
>> Is this _strictly_ required?
>
>No. The requirement should be:
>
>  1. The create/get/put/delete functions are non-inline (because dwarf info
>     is not as reliable as symbol);
>  2. From their argument list, we can always get the variable we need (the
>     pointer of objects, the value of refcnt, etc.)

However, we have to customize it for each application. Perf itself might be OK
but others might have different implementation.

Thanks,